siemens - Public Service Commission

Progress Energy Crystal River Unit 3
Request for Proposal for Engineering Services to Upgrade Secondary System
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1.9.13 Electrical Distribution System Calculations
A number of upgrades to the secondary plant will result in an increase in the electrical
load on the CR3 electrical distribution system, The Redundant lsophase Bus Ouct
Cooling System, Circulating Water pump motors, SC pump motors, Feedwater Booster
pump motors, and Condensate pump motors will result in significant load increases on
the electrical distribution system, An analysis of the distribution system is required that
must include new load flow, short circuit, motor starting and protection system
coordination studies. The goal of this calculation revision is lo evaluate the adequacy of
existing power system equipment ratings (auxiliary transformers, load centers, motor
control centers, switchgear, cables, etc) to support the higher system load and identify
required upgrades of the electrical distribution system.
An initial evaluation of the impact of ekpected electric load increases on the Station
Auxiliary Transformer, 4KV buses, circuit breakers, switchgear, and cabling is required
to determine any required equipment replacements.
The calculation revision will ensure that power system sources and components, such
as offsite power, transformers, cables and system protection circuits will either continue
to operate within their designed limits with the load increases expected, or identify
system changes needed to assure the planned reconfiguration will not affect the plant
licensing commitments. This study should be completed 2 years prior to the planned
uprate in 2011 to support procurement of equipment and modification packages as
required.
This calculation revision will update existing CR3 electrical distribution calculations. The
calculations currently utilize €TAP and other computer programs for the analysis as
folfows.
Voltage DroplShort Circuit for AC Electrical System - SKM Software
Non Safety 125 VDC - ETAP Software
The seller must identify any additional calculations that require revision as a result of the
EPU upgrades. Procedure EGR-NGGC-0017, Preparation and Control of Design
Analysis and Calculations, applies to this task.
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PEF-NCR-02006